Microphone

摘要

The present disclosure relates to a microphone, and more particularly, to a microphone capable of improving a signal-to-noise ratio (SNR) by receiving a sound pressure through at least two acoustic sensing modules.;According to an exemplary form of the present disclosure, a microphone includes first and second acoustic sensing modules including a diaphragm vibrated by a sound pressure introduced from the outside and a fixed membrane spaced apart from the diaphragm, and a signal processing module receiving first and second capacitance signals from each of the first and second acoustic sensing modules and removing and outputting noises included in the first and second capacitance signals based on the first and second capacitance signals.

主权项

1. A microphone, comprising:
a first acoustic sensing module including a first diaphragm configured to vibrate based on sound pressure introduced from outside the microphone and a first fixed membrane spaced apart from the first diaphragm; a second acoustic sensing module including a second diaphragm configured to vibrate based on sound pressure introduced from outside the microphone and a second fixed membrane spaced apart from the second diaphragm; and a signal processing module configured to receive a first capacitance signal and a second capacitance signal from the first acoustic sensing module and the second acoustic sensing module, respectively, wherein the signal processing module includes an amplifier, and the amplifier comprises:
a non-inverting input terminal coupled to the first acoustic sensing module, wherein the non-inverting input terminal is configured to receive the first capacitance signal, including noise, from the first acoustic sensing module;an inverting input terminal coupled to the second acoustic sensing module, wherein the inverting input terminal is configured to receive the second capacitance signal, including noise, from the second acoustic sensing module; andan output terminal configured to remove the noise included in the first capacitance signal, remove the noise included in the second capacitance signal, amplify the first capacitance signal to an amplified first capacitance signal, amplify the second capacitance signal to an amplified second capacitance signal, output an output signal based on the amplified first capacitance signal and the amplified second capacitance signal; wherein the first capacitance signal and the second capacitance signal are determined by sensitivities and capacitances of the first acoustic sensing module and the second acoustic sensing module, a sound pressure, a noise, and a bias.